In the case of a thyrotoxic goiter, the TSH is suppressed (less than 0.2). Of course, in some cases of Hashimoto's thyroiditis there is a temporary release of stored thyroid hormone (Hashitoxicosis, discussed in Chapter 5) causing a transient thyrotoxicosis. For the purposes of this section, we focus on goiters associated with prolonged thyrotoxicosis (see Chapter 4). There are two major categories: Graves' disease, associated with a diffuse toxic goiter, and toxic multinodular goiter (TMNG), associated with many autonomous nodules within a goiter.
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